Presidential hopeful Hillary Clinton and her husband Bill have reported that their income was more than $139million between 2007 and 2014 - even allowing for a tremendous nosedive in 2008 when she lost to Barack Obama in the Democrat Presidential contest.

The figures, outlined on Hillary's website, show that in 2007 the couple's income was $21million but it slumped to $5million the next year and took years to recover.

The bulk of the Clintons' income came from speeches delivered to corporate and interest groups by Bill Clinton and later by Hillary Clinton after she resigned as secretary of state in early 2013.

The Clintons' vast wealth is built on him being a former president and her a former secretary of state

In 2013 the couple earned $23million - including $9.68million from Hillary's speeches and $13.17million from Bill's speeches.

Most of Hillary's speeches were $225,000 apiece or more. Former US President Bill's ranged from $125,000 to $750,000 each, the disclosures showed.

Hillary, the front-runner in the race for the Democratic presidential nomination in 2016, said she released her family's federal income tax returns from 2007 to 2014 in keeping with a commitment for transparency.

She is struggling to overcome questions about her honesty that have arisen from a controversy over her use of a private email server for official business as secretary of state from 2009 to 2013.

A Quinnipiac University poll this week said 57 per cent of voters see Clinton as not honest and trustworthy.

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Presidential hopeful: Hillary giving a speech at Florida International University in Miami on Friday

The Clintons' adjusted gross income over the period was just shy of $139.1million. With deductions factored in, their taxable income was about $111 million.

They paid an overall federal tax rate of 31.6 per cent over the period - $43.9million - which is high for American taxpayers.

The couple also gave nearly $15million in charitable contributions.

All but about $200,000 of the money they gave as charity was distributed through the Clinton Family Foundation, which is distinct from the better-known Bill, Hillary & Chelsea Clinton Foundation. The family foundation provides charitable donations to a host of organizations.

Hillary said: 'We've come a long way from my days going door-to-door for the Children's Defense Fund and earning $16,450 as a young law professor in Arkansas - and we owe it to the opportunities America provides.'

In a statement accompanying her tax records, Clinton said she and her husband paid an effective federal tax rate of 35.7 percent last year and that the rate went up to 45.8 percent when state and local taxes were figured in.

The couple at college in 1969. Hillary said: 'We've come a long way from my days going door-to-door for the Children's Defense Fund and earning $16,450 as a young law professor in Arkansas'

On his way to the top: Bill as Governor of Arkansas in the 1980s, with wife Hillary by his side

The Clintons' vast wealth, built on his reputation as former president and her resume as a former secretary of state, has become an issue in a 2016 presidential race that has focused on how to reduce income inequality.

'Those at the top have to pay their fair share,' she said, noting she has called for closing the so-called carried interest loophole that wealthy financiers use to pay a lower tax rate.

The tax records were disclosed on the same day that the State Department released more of her emails from the period when she was secretary of state.

It also coincided with her campaign giving an overview of her doctor's physical examinations of her, calling her fit to serve.

In the evening Hillary and her husband were seen at a U2 gig in New York City's Madison Square Garden.

One of her Republican rivals, former Florida Governor Jeb Bush, released 33 years of tax records earlier this summer. The Clintons in the past have released tax records dating to 1977.

The couple relaxing last year. The latest records show they pay a relatively high 31.6 per cent in federal tax

Their latest records show that Bill made more than $4.2million in earnings from Laureate International Universities, where he was honorary chancellor for schools scattered across the globe. He had a five-year deal with the organization, starting in 2010, but ended his relationship last April, two weeks after his wife announced her bid for president.

Bill Clinton had not previously detailed his work for Laureate, but he appeared in 2013 at events for the operation's schools in Morocco, Brazil, Peru and Spain.

He was also paid $2.1million from the Dubai-based Verkey GEMS Foundation, whose CEO, Vikas Pota, aims to provide educations to more than 100million underprivileged children around the world through scholarships and teacher training.

Clinton's precise role with GEMS has not been disclosed, but he named the enterprise a strategic partner of his foundation's Clinton Global Initiative.